3M MP8750 manual Troubleshooting Problems and Solutions, Service Information

Section 7: Troubleshooting

7-1. Troubleshooting Problems and Solutions

Problem		Probable Cause	Possible Solution
Image is disturbed	∙	Wrong Sync setting.	∙ Set to factory default setting. (See below!)
or unstable.			∙ Change Sync setting in the Picture menu for optimum
	∙	Wrong Tracking	performance
		value.	∙ For vertical interference stripes, change the Tracking in the
			Picture menu for optimum performance.
No computer image	∙	Loose cable.	∙ Check and secure cable connections.
projected. Message	∙	No power to	∙ Turn on computer.
“Looking for signal		computer.
...” displays.	∙	Wrong synchro-	∙ Adjust synchronization mode of the projector to the synchro-
		nization mode.	nization mode of the computer via Advanced Setup menu.
No video image	∙	Loose cable.	∙ Check and secure cable connections.
projected.	∙	No signal from video	∙ Check video picture on TV.
		source.
Mouse does not	∙	Loose cable.	∙ Check and secure cable connections.
work.	∙	Wrong connection.	∙ For PS/2 and ADB (Apple) mouse a special adapter is
	∙	Wrong power up	necessary. Only use adapters from the original manufacturer
		sequence.	(Section 8-2).
			∙ The mouse emulation operates correctly only if the correct
			power up sequence has been used (refer to section 3-5.)
Image off-center.	∙	Image position.	∙ Center image with the Disc Pad of the control panel or on
			the remote control transmitter.
Cannot get entire	∙	Wrong Tracking	∙ If vertical interference stripes occur, change the Tracking
image on the		value.	value in the Picture menu for optimum performance.
screen.	∙	Compatibility	∙ Refer to the documentation for your graphic card. Change
		problem.	the Resolution setting in the Picture menu to the resolution
			of the video mode output from the computer graphic card.
Washed out image.	∙	Wrong Contrast	∙ Change Contrast setting in the Picture menu. The bar
		setting.	should be in the middle position.
	∙	Wrong Brightness	∙ Lower Brightness setting in the Picture menu. Choosing
		setting.	Brightness and pressing Enter can perform an automatic
			adjustment.
Humming noise.	∙	Signal sources are	∙ Locate the source of disturbance. Disconnect the sources
Slowly passing		connected to different	one after another from the projector. Connect all sources to
horizontal bars.		power sources.	a common power source.
	∙	VCR connected to	∙ Remove antenna connection from VCR. If the disturbance
		aerial system and to	disappears, use a by-pass filter (isolating transformer) to
		projector.	connect the antenna to the VCR.
	∙	Bad signal.	∙ Try different input source.

The factory default settings of the projector can be restored by pressing Enter and Mute simultaneously on the control panel when switching on the main power switch of the projector and pressing the Standby button afterwards.

The projector will start immediately and the message “ Parameter factory settings restored” displayed in the starting screen will indicate the default settings are reset.

7-2. Service Information

For product information, product assistance, service information, or to order accessories or spare parts, please call: In U.S. or Canada: 1-800-328-1371

In other locations, contact your local 3M Sales office.

© 3M 1999 3M™ Multimedia Projector MP8750 17